Popular questions

Are there other codes set? This code, by itself, P0421 indicates that the engine management system detected the catalytic converter is performing below expected standards. This means the engine is sending contaminants (unburned fuel, oil fumes, etc.) down the exhaust,...

Of course, first make sure that the engine is fully and correctly configured for CNG. If not, that alone will create problems, including overheating. If the engine is configured for CNG but it is still overheating, you can request an...

Hello there, thank you for asking about your 2001 Saab 9-5. I would recommend checking the idle air control valve. If you would like help, an expert from YourMechanic can come to your home or office to diagnose your car's...

Hello. Your car was equipped with an EPDM-based (ethylene propylene diene monomer) serpentine belt that theoretically can last the lifetime of that vehicle. It will certainly last at least ten years or 150,000 miles, whichever comes first. Nevertheless, belts can...

The shift cable ends go bad and get worn and will come off of transmission or at shift lever connection. You will need to replace the cable end bushing if replaceable or replace entire cable to repair it.

Anytime I've seen those little clips separated, the doors ended up being broken. The dealership usually has those clips in stock and the hardest part is getting the panel back on afterwards. You can have a certified mechanic, such as...

Hello. Though there are a lot of possible causes of this, the most common is the crankshaft position sensor. These fail all of the time on this engine. Before I change it I would usually scan the computer for codes....

Let's assume the clutch is not engaging. The clutch coil should simply be tested to determine if coil failure is the cause and it's easy to do. The integrity of the clutch coil can be tested on the car using...

Hi there. It's possible that one or two different issues are causing the cooling fan to not function correctly. The first would be that the cooling fan motor is damaged and needs to be replaced, while the other would be...

Hello there, this is a common fault on the Chevy K2500. There are many different possible causes for the engine to idle rough and have poor gas milage. The most common are the spark plugs, plug wires, cap & rotor,...

The clutch is hydraulic and may have a leak from the system causing the brake fluid to go low since it shares the same reservoir. You will need to have the brakes and clutch systems to see what one leaked...

The manual transmission on these vehicles had a bad reverse gear design and was very prone to failure after getting worn. The transmission reverse gears do not engage enough in these transmissions and after the gear wears will not engage...

Hello. This may potentially affect fuel economy due to the fact that this introduces more oxygen into the exhaust flow. When this happens, the oxygen sensor will detect additional oxygen flow which will cause it to relay this to the...

Unless you’ve gone off the pavement and into the wild, you’re driving your car on a road with a speed limit. It’s important to follow those limits, not only because they’re the law, but because they help ensure your safety....

Hi there. It sounds like your car has an oil issue. It sounds like it can be a combination of issues. I would usually get the vehicle in the air to check for leaks first. If it was just burning...

It's a very interesting system and generally it works quite well. But, for the rest of the car--Subarus are notorious for blowing head gaskets and if they have automatic transmission, automatic transmissions are known for wearing out. So if you...

Hi. We will be happy to help you. I believe that you have a brake hardware component coming out of place at times and scraping against a moving surface. This is a common occurrence. Another common occurrence that could cause...

This can happen for a wide variety of reasons. Unfortunately, without additional detail this cannot be diagnosed properly without inspecting the car. I would recommend having a certified expert, such as one from YourMechanic, come to your home to diagnose...

You have a blown headgasket and the coolant is getting in to engine cylinders and into the lower part of the engine. You will need heads removed and get them checked for cracks and warpage. If you have excessive coolant...

If you are continuing to get this code then you either got a bad sensor or you have an issue with a clog in the EGR lines. Both are common. Also, if the check engine light was not cleared after...

Hi again Jarod. What you're describing is often a sign of a vacuum leak, exhaust leak, fuel restriction or faulty mass air flow sensor (designed to help mix air and fuel together). To be honest, there are more than a...

You need to have the codes scanned by a professional with a scan tool for the transmission computer. The codes may give you an indication if the sensor is not performing correctly. If it is not a sensor malfunctioning (like...

Hey there, thanks for writing in about your 2014 Buick Verano. This could potentially be a charging system problem. As you may already know, your car has an onboard charging system called an alternator which works to keep your battery...

Hi there. Check the battery cables for any corrosion. If there is corrosion, then clean the battery posts with baking soda and water mixed. Then check the voltage on the battery. If the voltage is 12.6 to 12.4, then the...

It sounds like you may have a loose heat shield on your exhaust. These heat shields are installed to prevent exhaust heat from reaching other components of the vehicle. These shields can often rust themselves loose and cause this rattling...